Lock bolt and nut



' Patented May 2, 1922.

GEORGE HENRY THAMAN'N, OFODVINGTQN,

LOCK BOLT AND NUT.

Specification of Letters Patent.

Patented May 2., 192a;

Application filed March 10, 1921. Serial Hey 51 ,386.

To all whom it may concern Be it known that I, Gnonon a citizen of the United 5a) residing at (lovington, in the county of Kenton and State of: Kentucky. have invented certain new and. useful improvements in Lock Bolts and Nuts, of which the following is a specification.

This invention relates to improvements in look bolts and nuts.

The primary object of the invention is the provision of a lock nut for use in connection with a. bolt of special formation, whereby said nut may be securely locked in any determined posit-ion upon the bolt without liability of rupture of any of the parts of said nut or bolt; and preventing accidental detachment of the nut from the bolt.

A further object of the invention is the provision of a lock nut which is extremely simple in formation, necessitating a minimum of parts, very durably constructed, and providing an inexpensive structure, which can be manufactured at a cost not to exceed that of the ordinary castle nut; and which will, to a great extent, do away with the castle nut arrangement, inasmuch as greater security and a less troublesome arrangement is provided withthe improved bolt and lock nut, doingaway with the cotter pin arrangement on the ordinary castle nut, which in many instances is ineffective in niaintain a nut upon a bolt.

(lther objects and advantages will be apparent during the course or the following detailed description.

in the accompanying drawing, forming a part oi this specification, and in which Si] ilar reterence characters designate rorrespending; parts throughout the several views;

Figure 1 is a side elevation of the improved'bolt and lock nut structure.

Figure 2 is a side elevation of proved bolt and lock nut structure, details in cross section. v

Figure 3 is a bottom plan view of the improved lock nut structure assembled to a bolt, and showingthe operating relation. of the same to an adj Listing wrench.

figure 45 is a cross sectional vi w taken on the line H of Figure 2.

In the drawing, wherein for the purpose oil illustration is shown a preferred embodiment of my invention, the letter A desig- H, THAMANN,

the ir showing nates a bolt of the improved type, having the improved lock nut B mounted thereon, and which lock nut 13 includes the standard type of nut C, altered to a certain extent to thereon as in ordinary bolt construction.

The bolt A, how-ever, is of special construction, in that longitudinal grooves 12 are provided in the shank 1'0, and extending through the screw threaded portion 13 thereof, said'grooves being of sufiicientdepth-to be disposed immediately below the root-of the screw threads. It is preferred, that-the grooves 12 extend entirely through the screw threaded portion 13 of the shank and open out upon the-end 14 'o'l'the bolt. The grooves 12 are provided at diametrically opposite points upon the'shank 1.0, Grooves are provided in the screw tl'iread-ed port on 13 of the shank 10 at anangle of QO- -to the grooves '12, being; di.a'metrically -;opposed upon said shank, and extending-but a dis tance substantiallyone-halt of the screw threaded porticn 1S, and upon the'upper part thereof, for-a purpose to be subsequently set forth. j;

The nut is OfOIClifiW-i? P'OlfiflOiltLl for-- motion, being uniform in transverse cross section, throughout the depth thereof, and provided, as in ordinary construction, with the screw threaded bore 20-, as in ordinary construction adapted to receive the shank.

10 of the bolt. A. slot or recess 21 is pro vided in the nut (3., of uniformwidth, and which is cut into the nu-tQ at the point of juncture of two of the sides 22 out-the nut. The slot 21,, extends the entire distance through thenut C upon the "i'orr'u'rrd part- 23 thereof, and thus communicates with the bore 20. From the forward part 23 of said nut, the slot or recess 2]. inclines upwardly to provide shelf 24., rearwardly of which shelf is a depending aperture 25, adapted to receive an end of the spring which will be subsequently set forth. The slot 21 abruptly terminates upon the rear 26 of the C, and which communicate from one face 22 to the other face 22, as a means to facil entry of the pin 31 for pivotally supper said locking pawl D. The pawl is of F cient width to be comfortably operated with in the slot 21, and has an end 32, called the locking point, which is normally forced into the screw threaded bore 20 of the nut C by the resilient end 33 of the spring E, which engages in a suitable notch 3 formed upon the under surface of the locking pawl.

The spring E is preferably of some high grade type of spring steel, and has an end rigidly mounted in the aperture 25 of the nut C, and provided with an intermediate por tion 36 resting upon the shelf 24 of said nut (l, and having the resilient end 33 bent integral upon said intermediate portion 36, and as heretofore mentioned normally en gaging the notch 34 of the locking pawl D.

From the foregoing description, it can be seen that a locking pawl D has been provided, in which tl e locking point 32 is nor mally forced into the bore 20 of said nut C by the resilient spring ill. The pawl D is of suflicient formation that an end is adapted to engage the shoulder 27 of the nut fl, when the point 32 is raised from its communication in the bore 20. V

The operation of the improved lock nut B is effected in the same manner as the standard type of nut, and may be effected by an. ordinary oversized spanner wrench, or the a ordinary type of ad ustable monkey "r illustrated in dot and dash lines in u r 3 a C! of the drawing. When the wrench has been applied to opposite faces 22 of the nut C, a jaw of the wrench engages :he portion of the locking pawl D projecting from the slot 21 and upon adjustment of the jaws of said wrench, the locking pawl D will he rocked upon its pivot pin 31, thus lifting the lool e ing point 32 out of the bore 20, and said nut C can be rotated freely upon the shanl: 10 of the bolt A. When the desired da ij tion has been secured agai it any worl desired to clamp intermediate the *1 an the head 11, the wire 11 can be released b;

readjustment of the jaws, a i tie sprin. acting upon the locking pawl D will Tom the same upon the pivot pin 31 until the locking point 32 engages within a groove 3 or 15. i

It is preferred to provide the said gi'ooi-es l5, inasmuch as they will be used in cases where a very line adjustment of the nut is desired, and it can readily be seen that the nut C can be locked in any position upon the screw threaded portion 13 at each quarter turn thereof. The grooves 12 extend cntirely through the screw threaded portion 13 in order that the nut C will not become detached when said nut is positioned at any place upon the shank. Since the nut C will be positioned for a considerable distance upon the shank 10 before the same engages a piece of work, the groove 15 is not 6X- tended entirely through to the en d 14 of the bolt.

Various changes in the shape, size and arrangement of parts may be made to the form of my invention herein shown and described, without departing from the spirit of the in vention or the scope of the claims I claim:

1. A look nut of hexagonal formation having a screw threaded aperture centrally therein and provided with a slotted opening diagonally therein extending from the juncture point of adjacent sides and toward the center of said nut, a pawl pivoted in said slot, and spring means in said slot for normally forcing one end of said pawl toward the "crew threaded opening in said nut, said spring forcing the other end of said pawl to project from the juncture point of the ad jacent sides in which said slot is formed, in such manner that a wrench may be used on said nut for engaging the spring forced end of said pawl projecting from the juncture point of said nut and to rock the other end. of said pawl outwardly and away from the screw threaded opening in said nut for dis connecting the nut from a bolt 2. A nut lock comprising a hexagonal nut body provided with a screw threaded aperture therein and diagonally slotted from a juncture point of adjacent sides and toward the axis said nut, said slot sloping from the inside toward the outside face of said nut, a pin pivotally mounted through said nut from one face of aid bolt adjacent said slot and to extend through the other face adjacent said slot, said pin extending through said slot, a pawl pivotally mounted on said pin to have the forward lock end thereof to project from the outer face of said nut and extending toward the axis of said nut, a flat spring se cured in said slot and having a resilient end hereof engage the end of said pawl opposite its locking end, whereby said end projects outwardly from the planes of the sides of said nut adjacent said slot, and in such manner that a wrench may be used on d nut for engaging said projecting end of the pawl and to rock the locking endof said pawl outwardly and away from the axis of said nut. 

